Gerbils seek out older men to date.
His friend: I'd watch out for her, she's a gerbil
Andy: We didn't order these.
Bartender: They're from the two ladies over there.
(Points to two 10 year old girls)
Andy: Dude, nice! Thank you, ladies.
Bartender: Watchout, they're gerbils.
Bartender: Yeah, The opposite of cougars.